AFTER INSERT OR UPDATE ON student FOR EACH ROW BEGIN UPDATE college SET s_number = (SELECT COUNT() FROM student WHERE college_id = NEW.college_id), t_number = (SELECT COUNT() FROM teacher WHERE college_id = NEW.college_id) WHERE college_id = NEW.college_id; END;第三个where的作用是什么

mysql触发器这段代码哪里错了create or REPLACE TRIGGER setcomment_tr AFTER INSERT on setcomment for each ROW BEGIN UPDATE videoset SET commentnum = commentnum + 1 where videoset.setid = NEW.setid; end;

CREATE TRIGGER setcomment_tr AFTER INSERT ON setcomment FOR EACH ROW BEGIN UPDATE videoset SET commentnum = commentnum + 1 WHERE videoset.setid = NEW.setid; END; 这将创建一个名为 setcomment_tr...

create or replace trigger use_table after insert on open_table for each row declare PRAGMA AUTONOMOUS_TRANSACTION; begin update desk set state = '占用中' where desk_number = :new.desk_number; update desk set work_number_of_open_time = :new.staff_number where desk_number = :new.desk_number; update desk set open_time = to_char(sysdate) where desk_number = :new.desk_number; commit; end; /

2. 将desk表中桌号为插入记录的desk_number字段的记录的work_number_of_open_time字段更新为该记录的staff_number字段； 3. 将desk表中桌号为插入记录的desk_number字段的记录的open_time字段更新为当前系统时间； 4...

CREATE TRIGGER c_trigger AFTER INSERT ON student: FOR EACH ROW UPDATE class: SET num = num + 1 WHERE cid= new.cid;这段代码有什么错误

这段代码存在两个错误: 1. 在触发器的创建语句中，student: 和 class: 不应该出现。应该将它们替换为实际的...AFTER INSERT ON student FOR EACH ROW UPDATE class SET num = num + 1 WHERE cid = NEW.cid;

CREATE TRIGGER insert_order_trigger AFTER INSERT ON order_info EACH ROW BEGIN UPDATE order_info SET order_info.ord_price = ( SELECT food_info.food_price FROM food_info WHERE food_info.food_name = NEW.food_name ) WHERE food_info.food_no = NEW.food_no; END > 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'EACH ROW BEGIN UPDATE order_info SET order_info.ord_price = ( SELECT food_i' at line 1

SET order_info.ord_price = (SELECT food_info.food_price FROM food_info WHERE food_info.food_name = NEW.food_name) WHERE order_info.food_no = NEW.food_no; END; 希望这个修正能够解决您的问题！

CREATE TRIGGER room_status_trigger AFTER INSERT ON check_in FOR EACH ROW BEGIN UPDATE room SET status = 1 WHERE id = NEW.room_id; END;这个代码在sql server 里运行应该怎么改

在 SQL Server 中，FOR EACH ROW 应该被替换为 AFTER INSERT，而NEW.room_id应该改为 inserted.room_id。修改后的代码如下： CREATE TRIGGER room_status_trigger ON check_in AFTER INSERT AS BEGIN ...

Create trigger tg1 AFTER INSERT On 购买信息 for EACH ROW BEGIN Update 图书 set 库存量 = 库存量 – new.购买数量 where 图书编号 = new.图书编号; END

其中，trigger_name 是触发器的名称，table_name 是触发器所针对的表名，AFTER INSERT 表示触发器在插入操作之后执行，FOR EACH ROW 表示触发器对于每一行都会执行。触发器的主要操作是在 BEGIN 和 END...

分析代码CREATE TRIGGER UpdateEquipmentAmount AFTER INSERT ON Reservation FOR EACH ROW BEGIN UPDATE Equipment SET EquipmentAmount = EquipmentAmount - NEW.Quantity WHERE EquipmentID = NEW.EquipmentID; END;

这段代码是一个触发器，在每次向Reservation表中插入一行数据时，会自动执行该触发器。该触发器的功能是更新Equipment表中的EquipmentAmount字段，使其减去新插入数据的Quantity字段的值，更新的条件是EquipmentID...

create trigger update_purchase_warehouse after insert on purchase for each row Begin set @count; select count(*) into count from warehouse where com_no=NEW.com_no; IF (@count>0) THEN update warehouse set com_num=com_num+NEW.com_gnum where com_no=NEW.com_no; ELSE insert into warehouse(com_no,com_name,com_overdue,com_num) values(NEW.com_no,NEW.com_name,NEW.com_overdue,NEW.com_gnum); END if; END;

FOR EACH ROW BEGIN SET @count = 0; SELECT COUNT(*) INTO @count FROM warehouse WHERE com_no = NEW.com_no; IF (@count > 0) THEN UPDATE warehouse SET com_num = com_num + NEW.com_gnum WHERE ...

10.在takes表上定义1个触发器，当对takes表更新（update）一条记录后，如果更新后的学生ID不在对应的student表中，回滚该更新操作（注意：只考虑单条记录更新情况）；create trigger takes_update after update on takes for each row begin declare exist_id int; select count(*) into exist_id from student where new.ID=student.ID if exist_id=0 then signal sqlstate '45000' set message_text='Can not update.'; end if; end

SELECT COUNT(*) INTO exist_id FROM student WHERE new.ID = student.ID; IF exist_id = 0 THEN SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Can not update.'; END IF; END; 这个触发器的主要逻辑是，...

CREATE TRIGGER update_room_status AFTER INSERT ON Order FOR EACH ROW BEGIN UPDATE Room SET RoomStatus = '已预订' WHERE RoomID = NEW.RoomID; END;在sql server 中运行应该怎么改

UPDATE Room SET RoomStatus = '已预订' WHERE RoomID = (SELECT RoomID FROM inserted); END; 该触发器的作用和 MySQL 触发器相同，即在 Order 表中插入新数据后，自动更新 Room 表中对应房间的状态为...

当学生入住宿舍时，自动更新宿舍入住人数和剩余床位数。 CREATE TRIGGER update_bed_count AFTER INSERT ON student FOR EACH ROW BEGIN UPDATE dormitory SET dortel = dortel + 1, dorftel = dormax - dortel WHERE dorno = NEW.dorno; END;运行不了改正

1. 检查 student 表和 dormitory 表的表名和列名是否正确，特别注意大小写是否匹配。 2. 检查语法错误，例如缺少分号或括号不匹配等。 3. 确保您有足够的权限来创建触发器，例如必须是数据库管理员或具有 CREATE ...

Information-System-Based-on-JAVA-ME.rar_After On

The Design and Implement of the Mobile Students after-School Tutorial Information System Based on JAVA ME

The-X-ray-Chest-Image-Retrieval-Based-on-Feature-_After On_feedb

Based on the analysis of methods of CBIR and chest image characteristic, in this paper, color correlogam, dominant color of partition, gray level co-occurrence matrix, gray-gradient co-occurrence ...

java_after_hours.rar_After hours_java

java ebook - java after hours

AFTER INSERT OR UPDATE ON student FOR EACH ROW BEGIN UPDATE college SET s_number = (SELECT COUNT() FROM student WHERE college_id = NEW.college_id), t_number = (SELECT COUNT() FROM teacher WHERE college_id = NEW.college_id) WHERE college_id = NEW.college_id; END;第三个where的作用是什么

相关推荐

Counter_from_0_to_100.rar_COUNT 100_after_counter

ncp.rar_After On

Code.rar_After On_END POINT DETECTION_TEO

mysql触发器这段代码哪里错了create or REPLACE TRIGGER setcomment_tr AFTER INSERT on setcomment for each ROW BEGIN UPDATE videoset SET commentnum = commentnum + 1 where videoset.setid = NEW.setid; end;

CREATE TRIGGER c_trigger AFTER INSERT ON student: FOR EACH ROW UPDATE class: SET num = num + 1 WHERE cid= new.cid;这段代码有什么错误

CREATE TRIGGER room_status_trigger AFTER INSERT ON check_in FOR EACH ROW BEGIN UPDATE room SET status = 1 WHERE id = NEW.room_id; END;这个代码在sql server 里运行应该怎么改

Create trigger tg1 AFTER INSERT On 购买信息 for EACH ROW BEGIN Update 图书 set 库存量 = 库存量 – new.购买 数量 where 图书编号 = new.图书编号; END

分析代码CREATE TRIGGER UpdateEquipmentAmount AFTER INSERT ON Reservation FOR EACH ROW BEGIN UPDATE Equipment SET EquipmentAmount = EquipmentAmount - NEW.Quantity WHERE EquipmentID = NEW.EquipmentID; END;

CREATE TRIGGER update_room_status AFTER INSERT ON Order FOR EACH ROW BEGIN UPDATE Room SET RoomStatus = '已预订' WHERE RoomID = NEW.RoomID; END;在sql server 中运行应该怎么改

当学生入住宿舍时，自动更新宿舍入住人数和剩余床位数。 CREATE TRIGGER update_bed_count AFTER INSERT ON student FOR EACH ROW BEGIN UPDATE dormitory SET dortel = dortel + 1, dorftel = dormax - dortel WHERE dorno = NEW.dorno; END;运行不了改正

Information-System-Based-on-JAVA-ME.rar_After On

The-X-ray-Chest-Image-Retrieval-Based-on-Feature-_After On_feedb

java_after_hours.rar_After hours_java

最新推荐

新建文本文档.txt

开源Git gui工具Fork

yolov5在华为昇腾atlas上加速推理

zigbee-cluster-library-specification

管理建模和仿真的文件

MATLAB柱状图在信号处理中的应用：可视化信号特征和频谱分析

HSV转为RGB的计算公式

JSBSim Reference Manual

"互动学习：行动中的多样性与论文攻读经历"

MATLAB柱状图在数据分析中的作用：从可视化到洞察

Create trigger tg1 AFTER INSERT On 购买信息 for EACH ROW BEGIN Update 图书 set 库存量 = 库存量 – new.购买数量 where 图书编号 = new.图书编号; END